Keeney's leakproof turn-to-seal kitchen sink strainer features a stainless steel basket with safety rolled edges. It has a turn-to-seal post for positive sealing and a rust-proof basket. The strainer fits standard 3.5-in. kitchen sink drains and the twist post threads into the strainer body for a secure connection. It is easy to install with a screw closure with ground joint stopper and all necessary nuts and washers included. You can install with confidence knowing that Keeney products are backed by a Limited Warranty.